11666866 has 4 divisors (see below), whose sum is σ = 17500302. Its totient is φ = 5833432.

The previous prime is 11666861. The next prime is 11666867. The reversal of 11666866 is 66866611.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 66866611 = 7 ⋅9552373.

It can be written as a sum of positive squares in only one way, i.e., 6734025 + 4932841 = 2595^2 + 2221^2 .

It is a super-2 number, since 2×11666866² = 272231524523912, which contains 22 as substring.

It is a pancake number, because a pancake can be divided into 11666866 parts by 4830 straight cuts.

It is not an unprimeable number, because it can be changed into a prime (11666861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2916715 + ... + 2916718.

Almost surely, 2^11666866 is an apocalyptic number.

11666866 is a deficient number, since it is larger than the sum of its proper divisors (5833436).

11666866 is an equidigital number, since it uses as much as digits as its factorization.

11666866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5833435.

The product of its digits is 62208, while the sum is 40.

The square root of 11666866 is about 3415.6794346074. The cubic root of 11666866 is about 226.8043622219.

The spelling of 11666866 in words is "eleven million, six hundred sixty-six thousand, eight hundred sixty-six".